How remove margins

[Gbx]

How can i remove margins between QTabWidgets? Example - red oval on the right side.

Use the next code:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QTabWidget *tabWidget = new QTabWidget(this);
    tabWidget->setContentsMargins(0,0,0,0);
    tabWidget->addTab(new QWidget(), "test1");
    tabWidget->addTab(new QWidget(), "test2");
    tabWidget->widget(0)->setContentsMargins(0,0,0,0);
    tabWidget->widget(1)->setContentsMargins(0,0,0,0);
 
    setCentralWidget(tabWidget);
 
    QTabWidget *tabWidget2 = new QTabWidget(this);
    tabWidget2->setContentsMargins(0,0,0,0);
    tabWidget2->addTab(new QWidget(), "test1");
    tabWidget2->addTab(new QWidget(), "test2");
    tabWidget2->widget(0)->setContentsMargins(0,0,0,0);
    tabWidget2->widget(1)->setContentsMargins(0,0,0,0);
 
    QVBoxLayout *layout = new QVBoxLayout;
    layout->setContentsMargins(0,0,0,0);
    layout->addWidget(tabWidget2);
 
    tabWidget->widget(0)->setLayout(layout);
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QTabWidget *tabWidget = new QTabWidget(this);
    tabWidget->setContentsMargins(0,0,0,0);
    tabWidget->addTab(new QWidget(), "test1");
    tabWidget->addTab(new QWidget(), "test2");
    tabWidget->widget(0)->setContentsMargins(0,0,0,0);
    tabWidget->widget(1)->setContentsMargins(0,0,0,0);

    setCentralWidget(tabWidget);

    QTabWidget *tabWidget2 = new QTabWidget(this);
    tabWidget2->setContentsMargins(0,0,0,0);
    tabWidget2->addTab(new QWidget(), "test1");
    tabWidget2->addTab(new QWidget(), "test2");
    tabWidget2->widget(0)->setContentsMargins(0,0,0,0);
    tabWidget2->widget(1)->setContentsMargins(0,0,0,0);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->setContentsMargins(0,0,0,0);
    layout->addWidget(tabWidget2);

    tabWidget->widget(0)->setLayout(layout);
}

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